import com.fasterxml.jackson.databind.ObjectMapper;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: ws
 * Date: 2023-07-16
 * Time: 10:07
 */
class User {
    public String username;
    public String password;
}

//3. json格式
@WebServlet("/json")
public class JsonServlet extends HttpServlet {
    //使用jackson，最核心的对象就是ObjectMapper
    //通过这个对象，就可以把json字符串解析成java对象
    //也可以把一个java对象转换成一个json格式的字符串
    private ObjectMapper objectMapper = new ObjectMapper();

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //通过post请求一个body传递过来一个json格式的字符串
        User user = objectMapper.readValue(req.getInputStream(), User.class);
        System.out.println("username=" + user.username + ",password=" + user.password);

        resp.getWriter().write("ok");

    }

}
